Here is the full list of all 91 My Time At Portia achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Throw a party.
Workshop reputation reaches Level S.
Open 50 treasure chests.
Forced to sleep at 3:00 in the morning.
Achieve the best relationship with your spouse.
Encounter the rogue knight.
Clear all the levels in any Hazardous Ruins.
Give out a gift that the other person doesn't like.
Complete the new Portia Harbor.
Congratulations!
Talk with other town folks over 500 times.
Adopt Scraps.
Get more than 40 Ghost Badges in Haunted Cave Exploration.
Accumulatively give out 50 gifts that people like.
Complete South Block.
Fail at cooking 1 time.
The first photo taken with someone else.
Provide 100 Data Discs to the Church of the Light.
Enter the Abandoned Ruins for the first time.
Be ranked number one in a seasonal workshop ranking.
You missed a date.
Accumulate 10,000 Gols.
Find a diamond.
Keep the spiciness of the hotpot above 85 for 10 seconds during the Winter Solstice festival.
Did I just use the Blender to mix feces...?
Arrive at Portia.
Register your workshop.
Pass the test to enter the Collapsed Wasteland.
Help the Portia Tree Farm be operational again.
Help fix Ack the living AI.
Help build the Portia Bridge.
Opening Of The Museum
Expand the land area of the workshop to the maximum.
Complete all five Dee-dee transport commissions.
Provide 100 Data Discs to the Research Center.
Pick up 7 gifts during the Day of the Bright Sun event.
Try lasso roping for 50 times.
Win at Cross Five 50 times.
Gain 150 points in the Dart game.
Finish with a over 90% accuracy rate in the Balloons mini-game.
Win the highest possible award in the Slots mini-game.
Win 20 games of Rock Paper Scissors in 3-0 fashion.
Completed 100 Inspections at the Commerce Guild.
Cumulatively picked up 500 feces.
Recover 15 different types of relics.
Gather 50 assembly diagrams.
Complete 150 Commerce Guild commissions.
Successfully make 30 different dishes.
Discover a mysterious room in Abandoned Ruins.
Cut down 200 trees.
Get 300 items by kicking trees.
Place 5 advertisements in the Portia Times for the workshop.
Unlock all backpack slots.
Have maximum HP reach 2000.
Have maximum Stamina reach 600.
Defeated all the people that can spar in Portia.
Defeat 30 rare monsters.
Getting divorced.
You were at fault...
Adopt Pinky.
Everyone likes you!
Accumulatively give out 500 gifts.
Play the seesaw and get your playmate to catch a bird.
Accumulated 10 meals during dates and play dates.
Accumulated 10 times in the Swing mini-game where the play date is happy with the result.
Accumulated 10 times during the Doodles mini-game where the play date is happy with the result.
Recognize 5 different constellations.
Accept the proposal from Mint.
Accept Gust's proposal.
Pass the trials set by Ginger's family.
Complete Phyllis's Dream
Find more than 10 Ghost Badges in a single Day of Memories event.
Place first in five fishing competitions.
Use 50 Fireworks in one setting.
Getting caught by the Sky Shark Pirates.
Defeat the rogue knight and All Source.
Meet Pa.
Complete the main storyline.
Propose to Emily in front of the Pumpkin Princess House.
Enjoy some fireworks with Dr. Xu.
Complete the adventure in the cave with Arlo.
Have or adopt a child.
Have or adopt a second child.
Achieve the relationship "Happy Child" with your kid.
Throw ten parties.
Enter the Deepest Ruins.
Get to Level 50 of the Deepest Ruins without using Vending Machines.
Clear Level 10 of the Deepest Ruins.
Clear Level 50 of the Deepest Ruins.
Clear Level 100 of the Deepest Ruins.
Used all items from the Vending Machine in the Deepest Ruins.